1
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Pilato S, Moffa S, Siani G, Diomede F, Trubiani O, Pizzicannella J, Capista D, Passacantando M, Samorì P, Fontana A. 3D Graphene Oxide-Polyethylenimine Scaffolds for Cardiac Tissue Engineering. ACS Appl Mater Interfaces 2023; 15. [PMID: 36881875 PMCID: PMC10037243 DOI: 10.1021/acsami.3c00216] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
The development of novel three-dimensional (3D) nanomaterials combining high biocompatibility, precise mechanical characteristics, electrical conductivity, and controlled pore size to enable cell and nutrient permeation is highly sought after for cardiac tissue engineering applications including repair of damaged heart tissues following myocardial infarction and heart failure. Such unique characteristics can collectively be found in hybrid, highly porous tridimensional scaffolds based on chemically functionalized graphene oxide (GO). By exploiting the rich reactivity of the GO's basal epoxydic and edge carboxylate moieties when interacting, respectively, with NH2 and NH3+ groups of linear polyethylenimines (PEIs), 3D architectures with variable thickness and porosity can be manufactured, making use of the layer-by-layer technique through the subsequent dipping in GO and PEI aqueous solutions, thereby attaining enhanced compositional and structural control. The elasticity modulus of the hybrid material is found to depend on scaffold's thickness, with the lowest value of 13 GPa obtained in samples containing the highest number of alternating layers. Thanks to the amino-rich composition of the hybrid and the established biocompatibility of GO, the scaffolds do not exhibit cytotoxicity; they promote cardiac muscle HL-1 cell adhesion and growth without interfering with the cell morphology and increasing cardiac markers such as Connexin-43 and Nkx 2.5. Our novel strategy for scaffold preparation thus overcomes the drawbacks associated with the limited processability of pristine graphene and low GO conductivity, and it enables the production of biocompatible 3D GO scaffolds covalently functionalized with amino-based spacers, which is advantageous for cardiac tissue engineering applications. In particular, they displayed a significant increase in the number of gap junctions compared to HL-1 cultured on CTRL substrates, which render them key components for repairing damaged heart tissues as well as being used for 3D in vitro cardiac modeling investigations.
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Affiliation(s)
- Serena Pilato
- Dipartimento
di Farmacia, Università “G.
d’Annunzio” di Chieti-Pescara, Via dei Vestini, 66100 Chieti, Italy
| | - Samanta Moffa
- Dipartimento
di Farmacia, Università “G.
d’Annunzio” di Chieti-Pescara, Via dei Vestini, 66100 Chieti, Italy
| | - Gabriella Siani
- Dipartimento
di Farmacia, Università “G.
d’Annunzio” di Chieti-Pescara, Via dei Vestini, 66100 Chieti, Italy
| | - Francesca Diomede
- Dipartimento
di Tecnologie Innovative in Medicina & Odontoiatria, Università “G. d’Annunzio”
di Chieti-Pescara, Via
dei Vestini, 66100 Chieti, Italy
| | - Oriana Trubiani
- Dipartimento
di Tecnologie Innovative in Medicina & Odontoiatria, Università “G. d’Annunzio”
di Chieti-Pescara, Via
dei Vestini, 66100 Chieti, Italy
| | | | - Daniele Capista
- Dipartimento
di Scienze Fisiche e Chimiche, Università
degli Studi dell’Aquila, Via Vetoio, 67100 Coppito, L’Aquila, Italy
| | - Maurizio Passacantando
- Dipartimento
di Scienze Fisiche e Chimiche, Università
degli Studi dell’Aquila, Via Vetoio, 67100 Coppito, L’Aquila, Italy
| | - Paolo Samorì
- Université
de Strasbourg, CNRS, ISIS, 8 alleé Gaspard Monge, 67000 Strasbourg, France
| | - Antonella Fontana
- Dipartimento
di Farmacia, Università “G.
d’Annunzio” di Chieti-Pescara, Via dei Vestini, 66100 Chieti, Italy
- UdA—TechLab,
Research Center, Università “G.
d’Annunzio” di Chieti-Pescara, Via dei Vestini, 66100 Chieti, Italy
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2
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Costamagna M, Micheli E, Canale V, Ciulla M, Siani G, di Profio P, Tiecco M, Ciancaleoni G. Corrigendum to “Low-cost temperature transition mixtures (TTM) based on ethylene glycol/potassium hydroxide as reversible CO2 sorbents” [J. Mol. Liquids 340 (2021) 117180]. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Buonsenso F, Ghirga F, Romeo I, Siani G, Pilato S, Quaglio D, Pierini M, Botta B, Calcaterra A. Exploring the Assembly of Resorc[4]arenes for the Construction of Supramolecular Nano-Aggregates. Int J Mol Sci 2021; 22:ijms222111785. [PMID: 34769216 PMCID: PMC8584166 DOI: 10.3390/ijms222111785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/24/2021] [Accepted: 10/26/2021] [Indexed: 12/20/2022] Open
Abstract
Many biologically active compounds feature low solubility in aqueous media and, thus, poor bioavailability. The formation of the host-guest complex by using calixarene-based macrocycles (i.e., resorcinol-derived cyclic oligomers) with a good solubility profile can improve solubilization of hydrophobic drugs. Herein, we explore the ability of resorc[4]arenes to self-assemble in polar solutions, to form supramolecular aggregates, and to promote water-solubility of an isoflavone endowed with anti-cancer activity, namely Glabrescione B (GlaB). Accordingly, we synthesized several architectures featuring a different pattern of substitution on the upper rim including functional groups able to undergo acid dissociation (i.e., carboxyl and hydroxyl groups). The aggregation phenomenon of the amphiphilic resorc[4]arenes has been investigated in a THF/water solution by UV–visible spectroscopy, at different pH values. Based on their ionization properties, we demonstrated that the supramolecular assembly of resorc[4]arene-based systems can be modulated at given pH values, and thus promoting the solubility of GlaB.
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Affiliation(s)
- Fabio Buonsenso
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
| | - Francesca Ghirga
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
| | - Isabella Romeo
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
- Center for Life Nano and Neuroscience, Italian Institute of Technology, Viale Regina Elena 291, 00161 Rome, Italy
| | - Gabriella Siani
- Department of Pharmacy, University of Chieti “G. D’Annunzio”, Via dei Vestini 31, 66013 Chieti, Italy; (G.S.); (S.P.)
| | - Serena Pilato
- Department of Pharmacy, University of Chieti “G. D’Annunzio”, Via dei Vestini 31, 66013 Chieti, Italy; (G.S.); (S.P.)
| | - Deborah Quaglio
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
- Correspondence: (D.Q.); (M.P.)
| | - Marco Pierini
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
- Correspondence: (D.Q.); (M.P.)
| | - Bruno Botta
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
| | - Andrea Calcaterra
- Department of Chemistry and Technology of Drugs, “Department of Excellence 2018−2022”, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy; (F.B.); (F.G.); (I.R.); (B.B.); (A.C.)
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4
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Buonsenso F, Madio S, Ciogli A, Siani G, Pierini M. On-column quantification of amino functionalities bonded to solid porous matrices packed within high performance liquid chromatography columns. J Chromatogr A 2021; 1651:462284. [PMID: 34116269 DOI: 10.1016/j.chroma.2021.462284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 05/18/2021] [Accepted: 05/20/2021] [Indexed: 11/29/2022]
Abstract
Stationary phases (SPs) based on silica matrices functionalized with amino groups linked to their surface through alkyl chains of various length have found remarkable success in performing HILIC separations, showing really effective resolution towards a wide typology of compounds of biological interest, such as carbohydrates, nucleosides, purine and pyrimidine bases. Recently, we developed an operationally simple procedure, named DNBA-M, non-destructive for the analysed SP, designed to quantify the density of basic groups (typically amino groups) chemically bonded to the surface of porous solids. In the present study the DNBA-M procedure has been suitably modified to allow the quantification of any typology of amino groups present on silica matrices packed into HPLC columns. The new approach, named OC-DNBA-M, has been successfully validated through analysis of two HPLC columns packed with aminopropyl-silica matrices. Afterwards, it was also demonstrated as the OC-DNBA-M procedure may allow the effective and in-depth analysis of the structural composition characterizing SPs packed inside HPLC columns, in which amino-groups have been differently and only partially involved in following ureidic functionalizations. It was also proved how the analysed columns can be readily re-employed for the chromatographic applications for which they have been designed, without appreciable deterioration of the respective discrimination abilities.
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Affiliation(s)
- Fabio Buonsenso
- Dipartimento di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma "La Sapienza", Piazzale Aldo Moro 5, Roma 00185, Italy
| | - Sabrina Madio
- Dipartimento di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma "La Sapienza", Piazzale Aldo Moro 5, Roma 00185, Italy
| | - Alessia Ciogli
- Dipartimento di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma "La Sapienza", Piazzale Aldo Moro 5, Roma 00185, Italy
| | - Gabriella Siani
- Dipartimento di Farmacia, Università "G. d'Annunzio", Via dei Vestini 31, Chieti 66013, Italy
| | - Marco Pierini
- Dipartimento di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma "La Sapienza", Piazzale Aldo Moro 5, Roma 00185, Italy.
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5
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Siani G, Tiecco M, Di Profio P, Guernelli S, Fontana A, Ciulla M, Canale V. Physical absorption of CO2 in betaine/carboxylic acid-based Natural Deep Eutectic Solvents. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113708] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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6
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Manzi G, Buonsenso F, Ismail OH, Ciogli A, Siani G, Pierini M. Modular and conservative procedure for the quantification of amino functionalities bonded to solid porous matrices. Anal Chim Acta 2019; 1068:120-130. [DOI: 10.1016/j.aca.2019.04.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 04/04/2019] [Accepted: 04/06/2019] [Indexed: 12/11/2022]
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7
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Zappacosta R, Aschi M, Ammazzalorso A, Di Profio P, Fontana A, Siani G. Embedding calix[4]resorcinarenes in liposomes: Experimental and computational investigation of the effect of resorcinarene inclusion on liposome properties and stability. Biochim Biophys Acta Biomembr 2019; 1861:1252-1259. [PMID: 31028721 DOI: 10.1016/j.bbamem.2019.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 12/20/2018] [Accepted: 01/06/2019] [Indexed: 11/15/2022]
Abstract
Two calix[4]resorcinarenes, which differ in the length of the alkyl chain on the methylene bridge between the aromatic rings, have been embedded in unilamellar liposomes prepared from 1-palmitoyl-2-oleoyl-sn-glycerol-3-phosphocholine in three host/guest ratios, following two different procedures. The effect of the insertion of the guests has been evaluated through the measurements of the viscosity and the kinetic stability of the liposomal systems by means of the fluorescent probes pyrene and 5(6)-carboxyfluorescein. The presence of the guests reduces the viscosity of the liposomes, suggesting a modification of the bilayer structure. However, this does not affect liposome stability. A calix[4]resorcinarene cavitand with a more rigid conformation compared to the parent resorcinarene, has been also synthetized and embedded in liposomes. The free energy of the insertion of the substrates in the lipid bilayer has been evaluated through Molecular Dynamics simulations.
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Affiliation(s)
| | - Massimiliano Aschi
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi de L'Aquila, Coppito, Italy
| | | | - Pietro Di Profio
- Dipartimento di Farmacia, Università "G. d'Annunzio", Chieti, Italy
| | | | - Gabriella Siani
- Dipartimento di Farmacia, Università "G. d'Annunzio", Chieti, Italy.
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8
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Di Carlo R, Zara S, Ventrella A, Siani G, Da Ros T, Iezzi G, Cataldi A, Fontana A. Covalent Decoration of Cortical Membranes with Graphene Oxide as a Substrate for Dental Pulp Stem Cells. Nanomaterials (Basel) 2019; 9:nano9040604. [PMID: 31013705 PMCID: PMC6523176 DOI: 10.3390/nano9040604] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 04/08/2019] [Indexed: 12/12/2022]
Abstract
(1) Background: The aim of this study was to optimize, through a cheap and facile protocol, the covalent functionalization of graphene oxide (GO)-decorated cortical membrane (Lamina®) in order to promote the adhesion, the growth and the osteogenic differentiation of DPSCs (Dental Pulp Stem Cells); (2) Methods: GO-coated Laminas were fully characterized by Scannsion Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) analyses. In vitro analyses of viability, membrane integrity and calcium phosphate deposition were performed; (3) Results: The GO-decorated Laminas demonstrated an increase in the roughness of Laminas, a reduction in toxicity and did not affect membrane integrity of DPSCs; and (4) Conclusions: The GO covalent functionalization of Laminas was effective and relatively easy to obtain. The homogeneous GO coating obtained favored the proliferation rate of DPSCs and the deposition of calcium phosphate.
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Affiliation(s)
- Roberta Di Carlo
- Department of Pharmacy, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
| | - Susi Zara
- Department of Pharmacy, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
| | - Alessia Ventrella
- Department of Pharmacy, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
| | - Gabriella Siani
- Department of Pharmacy, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
| | - Tatiana Da Ros
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Piazzale Europa 1, 34127 Trieste, Italy.
| | - Giovanna Iezzi
- Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
| | - Amelia Cataldi
- Department of Pharmacy, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
| | - Antonella Fontana
- Department of Pharmacy, University "G. d'Annunzio", Via dei Vestini, 66100 Chieti, Italy.
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9
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Zappacosta R, Cornelio B, Pilato S, Siani G, Estour F, Aschi M, Fontana A. Effect of the Incorporation of Functionalized Cyclodextrins in the Liposomal Bilayer. Molecules 2019; 24:E1387. [PMID: 30970572 PMCID: PMC6479378 DOI: 10.3390/molecules24071387] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 04/05/2019] [Accepted: 04/06/2019] [Indexed: 11/16/2022] Open
Abstract
Liposomes loaded with drug–cyclodextrin complexes are widely used as drug delivery systems, especially for species with low aqueous solubility and stability. Investigation of the intimate interactions of macrocycles with liposomes are essential for formulation of efficient and stable drug-in-cyclodextrin-in-liposome carriers. In this work, we reported the preparation of unilamellar vesicles of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) embedded with native β-cyclodextrin and two synthetic derivatives: heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TMCD) and heptakis(2,3-di-O-acetyl)-β-cyclodextrin (DACD). We then studied the effect of these macrocycles on the liposomal size, membrane viscosity, and liposomal stability at different temperatures and concentrations. We observed that TMCD and DACD affected vesicle size and the change of size was related to CD concentration. Irrespective of its nature, the macrocycle established interactions with the phospholipidic head groups, preventing cyclodextrins to diffuse into the lipid bilayer, as confirmed by molecular dynamics simulations. Such supramolecular structuring improves liposome stability making these colloid systems promising carriers for biologically active compounds.
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Affiliation(s)
- Romina Zappacosta
- Dipartimento di Farmacia, Università "G. d'Annunzio", Via dei Vestini snc, I-66100 Chieti, Italy.
| | - Benedetta Cornelio
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014 & FR3038), 76000 Rouen, France.
| | - Serena Pilato
- Dipartimento di Farmacia, Università "G. d'Annunzio", Via dei Vestini snc, I-66100 Chieti, Italy.
| | - Gabriella Siani
- Dipartimento di Farmacia, Università "G. d'Annunzio", Via dei Vestini snc, I-66100 Chieti, Italy.
| | - François Estour
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014 & FR3038), 76000 Rouen, France.
| | - Massimiliano Aschi
- Dipartimento di Scienze Fisiche e Chimiche, Università di L'Aquila, Via Vetoio snc, I-67100 L'Aquila, Italy.
| | - Antonella Fontana
- Dipartimento di Farmacia, Università "G. d'Annunzio", Via dei Vestini snc, I-66100 Chieti, Italy.
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10
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Ferrone V, Carlucci M, Ettorre V, Cotellese R, Palumbo P, Fontana A, Siani G, Carlucci G. Dispersive magnetic solid phase extraction exploiting magnetic graphene nanocomposite coupled with UHPLC-PDA for simultaneous determination of NSAIDs in human plasma and urine. J Pharm Biomed Anal 2018; 161:280-288. [DOI: 10.1016/j.jpba.2018.08.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/30/2018] [Accepted: 08/03/2018] [Indexed: 01/01/2023]
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11
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Di Crescenzo A, Tiecco M, Zappacosta R, Boncompagni S, Di Profio P, Ettorre V, Fontana A, Germani R, Siani G. Novel zwitterionic Natural Deep Eutectic Solvents as environmentally friendly media for spontaneous self-assembly of gold nanoparticles. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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12
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Canale V, Germani R, Siani G, Fontana A, Di Profio P. Fractional ionization and size of cetyltrialkyl ammonium bromide and hydroxide micelles as a function of head-group lipophilicity and temperature. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.04.090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Di Giulio M, Zappacosta R, Di Lodovico S, Di Campli E, Siani G, Fontana A, Cellini L. Antimicrobial and Antibiofilm Efficacy of Graphene Oxide against Chronic Wound Microorganisms. Antimicrob Agents Chemother 2018; 62:e00547-18. [PMID: 29661876 PMCID: PMC6021640 DOI: 10.1128/aac.00547-18] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Indexed: 01/04/2023] Open
Abstract
Chronic wounds represent an increasing problem worldwide. Graphene oxide (GO) has been reported to exhibit strong antibacterial activity toward both Gram-positive and Gram-negative bacteria. The aim of this work was to investigate the in vitro antimicrobial and antibiofilm efficacy of GO against wound pathogens. Staphylococcus aureus PECHA 10, Pseudomonas aeruginosa PECHA 4, and Candida albicans X3 clinical isolates were incubated with 50 mg/liter of GO for 2 and 24 h to evaluate the antimicrobial effect. Optical and atomic force microscopy images were performed to visualize the effect of GO on microbial cells. Moreover, the antibiofilm effect of GO was tested on biofilms, both in formation and mature. Compared to the respective time controls, GO significantly reduced the S. aureus growth both at 2 and 24 h in a time-dependent way, and it displayed a bacteriostatic effect in respect to the GO t = 0; an immediate (after 2 h) slowdown of bacterial growth was detected for P. aeruginosa, whereas a tardive effect (after 24 h) was recorded for C. albicans Atomic force microscopy images showed the complete wrapping of S. aureus and C. albicans with GO sheets, which explains its antimicrobial activity. Moreover, significant inhibition of biofilm formation and a reduction of mature biofilm were recorded for each detected microorganism. The antibacterial and antibiofilm properties of GO against chronic wound microorganisms make it an interesting candidate to incorporate into wound bandages to treat and/or prevent microbial infections.
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Affiliation(s)
- Mara Di Giulio
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Romina Zappacosta
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Silvia Di Lodovico
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Emanuela Di Campli
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Gabriella Siani
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Antonella Fontana
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Luigina Cellini
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
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14
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Zappacosta R, Di Crescenzo A, Ettorre V, Fontana A, Pierini M, Siani G. Ionic Liquids as “Masking” Solvents of the Relative Strength of Bases in Proton Transfer Reactions. Chempluschem 2018; 83:35-41. [DOI: 10.1002/cplu.201700514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Romina Zappacosta
- Dipartimento di Farmacia; Università “G. d'Annunzio”; Via dei Vestini 31 66013 Chieti Italy
| | - Antonello Di Crescenzo
- Dipartimento di Farmacia; Università “G. d'Annunzio”; Via dei Vestini 31 66013 Chieti Italy
| | - Valeria Ettorre
- Dipartimento di Farmacia; Università “G. d'Annunzio”; Via dei Vestini 31 66013 Chieti Italy
| | - Antonella Fontana
- Dipartimento di Farmacia; Università “G. d'Annunzio”; Via dei Vestini 31 66013 Chieti Italy
| | - Marco Pierini
- Dipartimento di Chimica e Tecnologie del Farmaco; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro 5 00185 Roma Italy
| | - Gabriella Siani
- Dipartimento di Farmacia; Università “G. d'Annunzio”; Via dei Vestini 31 66013 Chieti Italy
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15
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Di Crescenzo A, Di Profio P, Siani G, Zappacosta R, Fontana A. Optimizing the Interactions of Surfactants with Graphitic Surfaces and Clathrate Hydrates. Langmuir 2016; 32:6559-6570. [PMID: 27264111 DOI: 10.1021/acs.langmuir.6b01435] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Surfactants are amphiphilic molecules active at the surface/interface and able to self-assemble. Because of these properties, surfactants have been extensively used as detergents, emulsifiers, foaming agents, and wetting agents. New perspectives have been opened by the exploitation of surfactants for their capacity to interact as well with simple molecules or surfaces. This feature article gives an overview of significant contributions in the panorama of the current research on surfactants, partly accomplished as well by our research group. We look at several recent applications (e.g., adsorption to graphitic surfaces and interactions with hydrate crystals) with the eye of physical organic chemists. We demonstrate that, from the detailed investigation of the forces involved in the interactions with hydrophobic surfaces, it is possible to optimize the design of the surfactant that is able to form a stable and unbundled carbon nanotube dispersion as well as the best exfoliating agent for graphitic surfaces. By studying the effect of different surfactants on the capacity to favor or disfavor the formation of a gas hydrate, it is possible to highlight the main features that a surfactant should possess in order to be devoted to that specific application.
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Affiliation(s)
- Antonello Di Crescenzo
- Dipartimento di Farmacia, Università "G. d'Annunzio" , Via dei Vestini, 66100 Chieti, Italy
| | - Pietro Di Profio
- Dipartimento di Farmacia, Università "G. d'Annunzio" , Via dei Vestini, 66100 Chieti, Italy
| | - Gabriella Siani
- Dipartimento di Farmacia, Università "G. d'Annunzio" , Via dei Vestini, 66100 Chieti, Italy
| | - Romina Zappacosta
- Dipartimento di Farmacia, Università "G. d'Annunzio" , Via dei Vestini, 66100 Chieti, Italy
| | - Antonella Fontana
- Dipartimento di Farmacia, Università "G. d'Annunzio" , Via dei Vestini, 66100 Chieti, Italy
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Menta S, Carradori S, Siani G, Secci D, Mannina L, Sobolev AP, Cirilli R, Pierini M. Elucidation of the mechanisms governing the thermal diastereomerization of bioactive chiral 1,3,4-thiadiazoline spiro-cyclohexyl derivatives towards their anancomeric stereoisomers. RSC Adv 2016. [DOI: 10.1039/c6ra13727j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis of bioactive 1,3,4-thiadiazoline-spiro-cyclohexyl-alkyl-substituted diastereomers by effective switching between kinetic and thermodynamic control.
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Affiliation(s)
- S. Menta
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
| | - S. Carradori
- Department of Pharmacy
- “G. D'Annunzio” University of Chieti-Pescara
- 66100 Chieti
- Italy
| | - G. Siani
- Department of Pharmacy
- “G. D'Annunzio” University of Chieti-Pescara
- 66100 Chieti
- Italy
| | - D. Secci
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
| | - L. Mannina
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
| | - A. P. Sobolev
- Laboratorio di Risonanza Magnetica “AnnalauraSegre”
- Istituto di Metodologie Chimiche CNR Area della Ricerca di Roma
- 00015 Monterotondo
- Italy
| | - R. Cirilli
- Dipartimento del Farmaco
- Istituto Superiore di Sanità
- 00161 Rome
- Italy
| | - M. Pierini
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
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Zappacosta R, Di Crescenzo A, Di Profio P, Fontana A, Siani G. Thermodynamic Analysis of Anion and Cation Effects on the Keto–Enol Equilibrium in Ionic Liquids. A Comparative Study with Conventional Solvents. J Org Chem 2015; 80:2333-8. [DOI: 10.1021/jo502898s] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Romina Zappacosta
- Dipartimento
di Farmacia, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | | | - Pietro Di Profio
- Dipartimento
di Farmacia, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Antonella Fontana
- Dipartimento
di Farmacia, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Gabriella Siani
- Dipartimento
di Farmacia, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
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18
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Zappacosta R, Di Giulio M, Ettorre V, Bosco D, Hadad C, Siani G, Di Bartolomeo S, Cataldi A, Cellini L, Fontana A. Liposome-induced exfoliation of graphite to few-layer graphene dispersion with antibacterial activity. J Mater Chem B 2015; 3:6520-6527. [DOI: 10.1039/c5tb00798d] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Liposome-induced exfoliation of graphite allowed to obtain few-layer graphene homogeneous in size and hydrophilic due to the non-covalent functionalization with phospholipids. The corresponding dispersions are stable for 48 h and demonstrate antimicrobial activity.
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Affiliation(s)
- R. Zappacosta
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - M. Di Giulio
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - V. Ettorre
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - D. Bosco
- Istituto di Genetica Molecolare
- CNR unità di Chieti
- I-66100 Chieti
- Italy
| | - C. Hadad
- Center of Excellence for Nanostructured Materials (CENMAT)
- INSTM
- Unit of Trieste
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Trieste
| | - G. Siani
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - S. Di Bartolomeo
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - A. Cataldi
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - L. Cellini
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
| | - A. Fontana
- Dipartimento di Farmacia
- Università ‘G. d'Annunzio’
- 66100 Chieti
- Italy
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Abstract
We have developed a simple artificial photoresponsive ion-gating device by inserting molecular switches in the membrane of liposomes. A controlled and directed proton transport across the bilayer membrane can lower the internal pH of the liposomes from neutral to around 4 under combined light and chemical stimulation.
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Affiliation(s)
- Romina Zappacosta
- Dipartimento di Farmacia, Università degli Studi "Gabriele d'Annunzio" , Via dei Vestini, I-66100 Chieti, Italy
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Gasbarri C, Angelini G, Fontana A, De Maria P, Siani G, Giannicchi I, Cort AD. Kinetics of demetallation of a zinc–salophen complex into liposomes. Biochimica et Biophysica Acta (BBA) - Biomembranes 2012; 1818:747-52. [DOI: 10.1016/j.bbamem.2011.10.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 09/07/2011] [Accepted: 10/18/2011] [Indexed: 01/10/2023]
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21
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Angelini G, Coletti C, De Maria P, Ballini R, Gasbarri C, Fontana A, Pierini M, Siani G. Effect of Ring Size on the Tautomerization and Ionization Reaction of Cyclic 2-Nitroalkanones: An Experimental and Theoretical Study. J Org Chem 2012; 77:899-907. [DOI: 10.1021/jo202065h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guido Angelini
- Dipartimento di Scienze del
Farmaco, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Cecilia Coletti
- Dipartimento di Scienze del
Farmaco, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Paolo De Maria
- Dipartimento di Scienze del
Farmaco, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Roberto Ballini
- School of Science and Technology,
Chemistry Division, Università di Camerino, 62032 Camerino (Macerata), Italy
| | - Carla Gasbarri
- Dipartimento di Scienze del
Farmaco, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Antonella Fontana
- Dipartimento di Scienze del
Farmaco, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
| | - Marco Pierini
- Dipartimento di Chimica e Tecnologie
del Farmaco, Università “La Sapienza”, P.le Aldo Moro 5, Roma, Italy
| | - Gabriella Siani
- Dipartimento di Scienze del
Farmaco, Università “G. d’Annunzio”, Via dei Vestini 31, Chieti, Italy
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Ciogli A, Fontana A, Gasparrini F, Maggini M, Giovannoli M, Pierini M, Busolo F, Siani G, Villani C. Inductive and Mesomeric Effects of the [60]Fulleropyrrolidine Fragment and [60]Fullerene Sphere: A Quantitative Evaluation Based on Theory and Experiments. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100997] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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De Maria P, Fontana A, Siani G, D’Aurizio E, Cerichelli G, Chiarini M, Angelini G, Gasbarri C. Synthesis and aggregation behaviour of a new sultaine surfactant. Colloids Surf B Biointerfaces 2011; 87:73-8. [DOI: 10.1016/j.colsurfb.2011.05.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 04/01/2011] [Accepted: 05/03/2011] [Indexed: 10/18/2022]
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Gasbarri C, Guernelli S, Boncompagni S, Angelini G, Siani G, De Maria P, Fontana A. Fine-tuning of POPC liposomal leakage by the use of beta-cyclodextrin and several hydrophobic guests. J Liposome Res 2010; 20:202-10. [PMID: 19848554 DOI: 10.3109/08982100903244526] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The effect of entrapped beta-cyclodextrin (beta-CD) on the stability of multilamellar vesicles (MLVs) of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), prepared by the dehydration-rehydration method, was studied by monitoring the release of 5(6)-carboxyfluorescein encapsulated into the liposomes. Different hydrophobic guests, such as Fullerene C(60), have been incorporated into the POPC bilayer in order to modify the membrane composition. The kinetic results as well as ESI-MS measurements evidenced that the destabilizing activity of beta-CD is due to the formation of beta-CD inclusion complexes and the consequent removal of selected bilayer constituents from the liposomal membrane. Hence, when beta-CD was added to the liposomes in the form of a strong, water-soluble 2:1 beta-CD/C(60) inclusion complex, such a destabilizing effect was not observed. However, the same beta-CD/C(60) inclusion complex does not form as a result of C(60) extraction from the bilayer. This may be attributed either to the overwhelming concentration of POPC with respect to C(60) and/or to the fact that C(60) is largely aggregated in the bilayer. Turbidimetric and fluorimetric determinations of lamellarity and entrapped volume of the studied MLVs provided further evidence of the alteration of the liposomal bilayer as a consequence of the addition of beta-CD and/or the presence of the studied guests.
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Affiliation(s)
- Carla Gasbarri
- Dipartimento di Scienze del Farmaco, Università G. d'Annunzio, Chieti, Italy
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Angelini G, De Maria P, Chiappe C, Fontana A, Pierini M, Siani G. Basicity of Pyridine and Some Substituted Pyridines in Ionic Liquids. J Org Chem 2010; 75:3912-5. [DOI: 10.1021/jo100570x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Guido Angelini
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Paolo De Maria
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Cinzia Chiappe
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi, Via Risorgimento 35, Pisa, Italy
| | - Antonella Fontana
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Marco Pierini
- Dipartimento di Chimica e Tecnologia del Farmaco, Università “La Sapienza”, P.le Aldo Moro, Roma, Italy
| | - Gabriella Siani
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
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26
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Angelini G, De Maria P, Chiappe C, Fontana A, Gasbarri C, Siani G. The Base-Catalyzed Keto−Enol Interconversion of 2-Nitrocyclohexanone in Ionic Liquids. J Org Chem 2009; 74:6572-6. [DOI: 10.1021/jo901029c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guido Angelini
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Paolo De Maria
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Cinzia Chiappe
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi Via Risorgimento 35, Pisa, Italy
| | - Antonella Fontana
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Carla Gasbarri
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
| | - Gabriella Siani
- Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio” Via dei Vestini 31, Chieti, Italy
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27
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Cirilli R, Costi R, Di Santo R, La Torre F, Pierini M, Siani G. Perturbing Effects of Chiral Stationary Phase on Enantiomerization Second-Order Rate Constants Determined by Enantioselective Dynamic High-Performance Liquid Chromatography: A Practical Tool to Quantify the Accessible Acid and Basic Catalytic Sites Bonded on Chromatographic Supports. Anal Chem 2009; 81:3560-70. [DOI: 10.1021/ac802212s] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roberto Cirilli
- Dipartimento del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy, Istituto Pasteur Fondazione Cenci Bolognetti, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale A. Moro 5, I-00185 Rome, Italy, and Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio”, via dei Vestini 31-66013 Chieti, Italy
| | - Roberta Costi
- Dipartimento del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy, Istituto Pasteur Fondazione Cenci Bolognetti, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale A. Moro 5, I-00185 Rome, Italy, and Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio”, via dei Vestini 31-66013 Chieti, Italy
| | - Roberto Di Santo
- Dipartimento del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy, Istituto Pasteur Fondazione Cenci Bolognetti, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale A. Moro 5, I-00185 Rome, Italy, and Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio”, via dei Vestini 31-66013 Chieti, Italy
| | - Francesco La Torre
- Dipartimento del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy, Istituto Pasteur Fondazione Cenci Bolognetti, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale A. Moro 5, I-00185 Rome, Italy, and Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio”, via dei Vestini 31-66013 Chieti, Italy
| | - Marco Pierini
- Dipartimento del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy, Istituto Pasteur Fondazione Cenci Bolognetti, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale A. Moro 5, I-00185 Rome, Italy, and Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio”, via dei Vestini 31-66013 Chieti, Italy
| | - Gabriella Siani
- Dipartimento del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy, Istituto Pasteur Fondazione Cenci Bolognetti, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale A. Moro 5, I-00185 Rome, Italy, and Dipartimento di Scienze del Farmaco, Università “G. d’Annunzio”, via dei Vestini 31-66013 Chieti, Italy
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Cirilli R, Costi R, Di Santo R, Gasparrini F, La Torre F, Pierini M, Siani G. A rational approach to predict and modulate stereolability of chiral α substituted ketones. Chirality 2009; 21:24-34. [DOI: 10.1002/chir.20589] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Siani G, Angelini G, De Maria P, Fontana A, Pierini M. Solvent effects on the rate of the keto-enol interconversion of 2-nitrocyclohexanone. Org Biomol Chem 2008; 6:4236-41. [PMID: 18972056 DOI: 10.1039/b813011f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rates of tautomerization of 2-nitrocyclohexanone (2-NCH) have been measured spectrophotometrically at 25.0 +/- 0.1 degrees C in several organic aprotic solvents and their binary mixtures. In cyclohexane the reaction is effectively catalyzed by bases and inhibited by acids while the so-called "spontaneous reaction" appears essentially due to autocatalysis. Apparent second order rate constants (k(app)(B)) for the reaction catalyzed by triethylamine (TEA) and pyridine (Pyr) have been obtained. From the experimental k(app)(B) values rate constants for the enolization (k(1)(B)) and ketonization (k(-1)(B)) reactions have been calculated. A Kamlet-Taft type linear solvation energy relationship (LSER) adequately accounts for the observed solvent effects. Activation parameters for both reactions show that solvent effects are mainly entropic in origin and that there is a shift of the transition state from a ketone-like to an enol-like structure on passing from less to more polar solvents.
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Affiliation(s)
- Gabriella Siani
- Dipartimento di Scienze del Farmaco, Università G. d'Annunzio Via dei Vestini 31, Chieti, Italy.
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Maria PD, Fontana A, Gasbarri C, Siani G, Zanirato P. Kinetics of the Z-E isomerization of monosubstituted azobenzenes in polar organic and aqueous micellar solvents. ARKIVOC 2008. [DOI: 10.3998/ark.5550190.0010.803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Abstract
The keto-enol tautomerism of 2-nitrocyclohexanone (2-NCH) was studied in aqueous solution under different experimental conditions. Ketonization rate constants were measured spectrophotometrically at 25 degrees C at an ionic strength of 0.4 mol dm-3 (NaCl) in diluted hydrochloric acid, in diluted sodium hydroxide, and in several buffers by using NaHSO3 as the scavenger of the keto form. A value of pK(a)(EH) = 4.78 for the enol form was obtained from the rate-pH profile of the reaction. A value of pK(a)(KH) = 5.97 for the keto form was directly obtained from the UV-vis spectra of 2-NCH recorded at different pHs. The equilibrium constant for the keto-enol tautomerism, pK(T) = -log([enol]/[ketone]) = 1.19, was obtained by combining the two pKa values (pK(T) = pK(a)(KH) - pK(a)(EH)). A comparison of these results with the corresponding values (Keefe, J. R.; Kresge, A. J. In The Chemistry of Enols; Rappoport, Z., Ed.; Wiley & Sons: New York, 1990; pp 399-480) for cyclohexanone shows the dramatic effects of an alpha-nitro substituent on the keto-enol acidities and the tautomerization constant of alicyclic ketones. Rates and equilibria were discussed in the light of the Brønsted equation, the principle of nonperfect synchronization, and the Marcus theory. It turns out that, on passing from nitroalkanes to nitroketones, the resonance contribution to pKa and deprotonation rate decreases, being overwhelmed by steric and inductive effects.
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Affiliation(s)
- Guido Angelini
- Dipartimento di Scienze del Farmaco, Università "G. d'Annunzio", Via dei Vestini 31, Chieti, Italy
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Angelini G, Chiappe C, De Maria P, Fontana A, Gasparrini F, Pieraccini D, Pierini M, Siani G. Determination of the Polarities of Some Ionic Liquids Using 2-Nitrocyclohexanone as the Probe. J Org Chem 2005; 70:8193-6. [PMID: 16277347 DOI: 10.1021/jo050288g] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Solute-solvent interactions on the keto-enol tautomerism of 2-nitrocyclohexanone in several organic solvents and room-temperature ionic liquids (RTILs) have been analyzed in terms of multiparameter equations. Permittivity and cohesive pressure values of the RTILs, unavailable by direct measurements, have been derived.
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Affiliation(s)
- Guido Angelini
- Dipartimento di Scienze del Farmaco, Università G. d'Annunzio Via dei Vestini 31, Chieti, Italy
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33
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De Maria P, Fontana A, Gasbarri C, Siani G. The effects of cationic and zwitterionic micelles on the keto–enol interconversion of 2-phenylacetylfuran and 2-phenylacetylthiophene. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.05.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Angelini G, Cerichelli G, Cerritelli S, Pierini M, Siani G, Villani C. An Effective Simulation of Aqueous Micellar Aggregates by Computational Models. J Comput Aided Mol Des 2005; 19:259-69. [PMID: 16163452 DOI: 10.1007/s10822-005-4994-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2004] [Accepted: 04/04/2005] [Indexed: 10/25/2022]
Abstract
We have computationally studied the interaction modes, localization and orientation of a benzene (Bz) molecule on the surface of micelles formed by cetyltrimethylammonium salts CTAX. Experimental 1H-NMR data on complexation shifts induced by Bz on the polar head hydrogens and on the adjacent methylene hydrogens of CTAX have been interpreted using a computational approach that combines an automatic molecular docking procedure with a calculation module that accounts for NMR complexation shifts due to ring current diamagnetic anisotropy. Three different models were used to reduce the complexity of the micellar system. Computational results, in good agreement with available experimental data, point to a preferential localization of the Bz molecule along the CTAX alkyl tail, about 3.9 angstroms away from the charged nitrogen. The Bz molecular plane is predicted perpendicular to the C-H bonds of the alkyl tail. The good results obtained with the simplest model suggest that it could be used to study more complex systems involving surfactants endowed with molecular recognition or catalytic abilities.
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Affiliation(s)
- Guido Angelini
- Dipartimento di Scienze del Farmaco, Università G. d'Annunzio, Via dei Vestini 31, 66013, Chieti, Italy
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De Maria P, Filippone P, Fontana A, Gasbarri C, Siani G, Velluto D. Cardanol as a replacement for cholesterol into the lipid bilayer of POPC liposomes. Colloids Surf B Biointerfaces 2005; 40:11-8. [PMID: 15620834 DOI: 10.1016/j.colsurfb.2004.09.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2004] [Indexed: 11/30/2022]
Abstract
Large unilamellar liposomes were prepared by hydration of 1-palmitoyl-2-oleylphosphatydilcholine (POPC) films and subsequent extrusion of the obtained liposomal suspension. Inclusion of cholesterol and cardanol brings about a stabilization of the membranes of the liposomes, as determined by their rates of release of entrapped 5(6)-carboxyfluorescein. The liposome breakdown was promoted by a non-ionic surfactant (Triton X-100) and the kinetic measurements were carried out by fluorimetry in water at 25 degrees C. Morphological analyses of giant POPC liposomes in the presence and in the absence of both guests were also performed. The results obtained suggest the use of cardanol (an easy available natural product) as a replacement for cholesterol as a new possibility for stabilizing liposomes in drug targetting.
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Affiliation(s)
- Paolo De Maria
- Dipartimento di Scienze del Farmaco, Università G. d'Annunzio, Via dei Vestini 31, 66013 Chieti, Italy
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Fontana A, De Maria P, Siani G, Robinson BH. Kinetics of breakdown of vesicles from didodecyldimethylammonium bromide induced by single chain surfactants and by osmotic stress in aqueous solution. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/j.colsurfb.2003.08.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Guernelli S, Laganà M, Mezzina E, Ferroni F, Siani G, Spinelli D. Supramolecular Complex Formation: A Study of the Interactions betweenβ-Cyclodextrin and Some Different Classes of Organic Compounds by ESI-MS, Surface Tension Measurements, and UV/Vis and1H NMR Spectroscopy. European J Org Chem 2003. [DOI: 10.1002/ejoc.200300456] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Maria PD, Fontana A, Siani G, Arcadi A, Chiarini M. Keto–enol interconversion of 2-phenacylfuran in aqueous solution and in the presence of surfactant micelles. ARKIVOC 2002. [DOI: 10.3998/ark.5550190.0003.b03] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Fontana A, Maria PD, Pierini M, Siani G, Cerritelli S, Macaluso G. Ab initioanalysis on metal ion catalysis in the enolization reactions of some acetylheterocycles: kinetics of the enolization reactions of 3-acetyl-5-methylisoxazole, 5-acetyl-3-methylisoxazole and 3(5)-acetylpyrazole. J PHYS ORG CHEM 2002. [DOI: 10.1002/poc.474] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Siani G, Paterne M, Michel E, Sulpizio R, Sbrana A, Arnold M, Haddad G. Mediterranean Sea surface radiocarbon reservoir age changes since the last glacial maximum. Science 2001; 294:1917-20. [PMID: 11729315 DOI: 10.1126/science.1063649] [Citation(s) in RCA: 259] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Sea surface reservoir ages must be known to establish a common chronological framework for marine, continental, and cryospheric paleoproxies, and are crucial for understanding ocean-continent climatic relationships and the paleoventilation of the ocean. Radiocarbon dates of planktonic foraminifera and tephra contemporaneously deposited over Mediterranean marine and terrestrial regions reveal that the reservoir ages were similar to the modern one (approximately 400 years) during most of the past 18,000 carbon-14 years. However, reservoir ages increased by a factor of 2 at the beginning of the last deglaciation. This is attributed to changes of the North Atlantic thermohaline circulation during the massive ice discharge event Heinrich 1.
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Affiliation(s)
- G Siani
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Unité Mixte de Service, CNRS, Avenue de la Terrasse, F-91118 Gif-sur-Yvette, France
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